Crazy you can run the AC off that….i had no idea. I will assume that is $$$$$$$$$
Lithium batteries have been game changing. Yes, definitely some $$ up front, but cheaper than a set of 2000W inverter generators and the cost of replacing lead acid batteries every 4-years.
If I did it again, I would go with a 24 or 36v system so I could reduce the wire sizes and run the solar panels strictly in series. Right now I had to run the panels in two 600w series strings, then parallel the two strings together to keep the charge controller happy. Lots of 000 gauge wire between the batteries to various on/off switches, fuses, and bus blocks.